A stalk of celery once. Very effective, so long as you don’t plan on cooking it , afterward. What about bizarre items, though? MY hubby has used the TV remote more than once, but the most imaginative and impromptu was probably a naked, balding Barbie doll. (With Barbie being held by her unnaturally slender ankles.) It worked well enough, and hurt like blazes until poor Barbie’s head and one of her arms flew off across the room. We both cracked up, and the stern disciplinary mood was totally lost.